From: Sudeep Holla <sudeep.holla@kernel.org>
To: Huisong Li <lihuisong@huawei.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>,
MyungJoo Ham <myungjoo.ham@samsung.com>,
Sudeep Holla <sudeep.holla@kernel.org>,
Kyungmin Park <kyungmin.park@samsung.com>,
Chanwoo Choi <cw00.choi@samsung.com>,
linux-acpi@vger.kernel.org
Subject: Re: [PATCH 4/6] devfreq: hisi_uncore: Preserve PCC shared memory signature
Date: Thu, 2 Jul 2026 11:25:00 +0100 [thread overview]
Message-ID: <20260702-nondescript-scrupulous-dalmatian-da23be@sudeepholla> (raw)
In-Reply-To: <20260627-acpi_pcc_signature-v1-4-c1b7268d4fdc@kernel.org>
On Sat, Jun 27, 2026 at 05:37:32PM +0100, Sudeep Holla wrote:
> ACPI specification defines the generic PCC shared memory signature as
> the PCC base signature ORed with the subspace ID.
>
> ACPI 6.6 added clarification that the signature is populated by the
> platform and verified by OSPM.
>
> The PCC mailbox controller now validates the signature when the channel
> is requested. Stop copying a complete local PCC header into shared
> memory and write only the command, status and payload fields, leaving
> the platform-populated signature intact.
>
Based on the discussions in 1/6, I assume 4/6 and 5/6 doesn't work well
for Hisilicon platforms. So I will drop them. I will just post 1/6 reducing
it to a warning.
--
Regards,
Sudeep
next prev parent reply other threads:[~2026-07-02 10:25 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-27 16:37 [PATCH 0/6] ACPI/PCC: Preserve platform-populated PCC signatures Sudeep Holla
2026-06-27 16:37 ` [PATCH 1/6] mailbox: pcc: Validate shared memory signature on request Sudeep Holla
2026-06-30 9:02 ` lihuisong (C)
2026-06-30 9:18 ` lihuisong (C)
2026-06-30 10:17 ` Sudeep Holla
2026-06-27 16:37 ` [PATCH 2/6] hwmon: xgene: Stop writing PCC shared memory signature Sudeep Holla
2026-06-29 21:11 ` Guenter Roeck
2026-06-27 16:37 ` [PATCH 3/6] i2c: xgene-slimpro: " Sudeep Holla
2026-06-27 16:37 ` [PATCH 4/6] devfreq: hisi_uncore: Preserve " Sudeep Holla
2026-07-02 10:25 ` Sudeep Holla [this message]
2026-07-06 9:15 ` lihuisong (C)
2026-06-27 16:37 ` [PATCH 5/6] soc: hisilicon: kunpeng_hccs: Preserve PCC signatures Sudeep Holla
2026-06-27 16:37 ` [PATCH 6/6] ACPI: PCC: Preserve shared memory signature in OpRegion handler Sudeep Holla
2026-06-30 12:33 ` Rafael J. Wysocki (Intel)
2026-06-30 17:00 ` Sudeep Holla
2026-07-01 10:44 ` Rafael J. Wysocki (Intel)
2026-07-01 13:34 ` Sudeep Holla
2026-07-01 14:13 ` Sudeep Holla
2026-07-01 14:39 ` Rafael J. Wysocki (Intel)
2026-07-02 12:19 ` Sudeep Holla
2026-06-30 9:25 ` [PATCH 0/6] ACPI/PCC: Preserve platform-populated PCC signatures lihuisong (C)
2026-06-30 10:49 ` Sudeep Holla
2026-07-01 7:38 ` lihuisong (C)
2026-07-02 10:21 ` Sudeep Holla
2026-07-06 9:02 ` lihuisong (C)
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